Assembly of rotary hydraulic pumps

Details Assembly of rotary hydraulic pumps Assembly of rotary hydraulic pumps

1995-07-10

1996-12-24

Freay, Charles G.

Rotary expansible chamber devices

Diverse rotary expansible chamber devices

4171991, F01C 136

Patent

active

055868754

ABSTRACT:
A first pump includes inner and outer intermeshing rotors, the outer rotor formed with external gear teeth. A second pump includes inner and outer meshing rotors, the outer rotor of the second pump having teeth continually engaged with the external teeth of the first pump outer rotor. The inner and outer rotors are formed with mutually intermeshing lobes that define between them pumping chambers through which hydraulic fluid is moved from a suction inlet to a pressurized outlet. A third pumping element includes pumping chambers located in the spaces between the intermeshing involute gear teeth on the outer rotors of the first and second pumps. A passage plate defines suction and pressure passages, which carry hydraulic fluid from a reservoir or sump to outlet ports, through which fluid is supplied to the hydraulic system.

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patent: 3182596 (1965-05-01), Prijatel
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patent: 3635604 (1972-01-01), Petersen et al.
patent: 3824041 (1974-07-01), Rystrom
patent: 4519755 (1985-05-01), Hanson
patent: 4592706 (1986-06-01), Matsuo et al.
patent: 4619588 (1986-10-01), Moore, III
patent: 4631009 (1986-12-01), Cygnor et al.

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